diff --git a/lib/routes/pnas/index.js b/lib/routes/pnas/index.js
index cddb3ae78..6feb7602a 100644
--- a/lib/routes/pnas/index.js
+++ b/lib/routes/pnas/index.js
@@ -4,13 +4,13 @@ const got = require('@/utils/got');
 module.exports = async (ctx) => {
     const baseUrl = `https://www.pnas.org`;
 
-    const tid = ctx.params.tid;
+    const topic = ctx.params.topic;
 
     let url = `${baseUrl}/content/early/recent`;
-    if (tid !== 'latest') {
-        url = `${baseUrl}/content/by/section/${ctx.params.tid}`;
+    if (topic && topic !== 'latest') {
+        url = `${baseUrl}/content/by/section/${ctx.params.topic}`;
     } else {
-        ctx.params.tid = 'Latest Research';
+        ctx.params.topic = 'Latest Research';
     }
 
     const res = await got.get(url);
@@ -59,7 +59,7 @@ module.exports = async (ctx) => {
         })
     );
     ctx.state.data = {
-        title: `PNAS | ${ctx.params.tid}`,
+        title: `PNAS | ${ctx.params.topic}`,
         link: url,
         item: out,
     };